CN101066793A - Process of eliminating heavy metals from city sewage and sludge - Google Patents

Process of eliminating heavy metals from city sewage and sludge Download PDF

Info

Publication number
CN101066793A
CN101066793A CNA2007101080520A CN200710108052A CN101066793A CN 101066793 A CN101066793 A CN 101066793A CN A2007101080520 A CNA2007101080520 A CN A2007101080520A CN 200710108052 A CN200710108052 A CN 200710108052A CN 101066793 A CN101066793 A CN 101066793A
Authority
CN
China
Prior art keywords
sludge
mud
reactor
heavy metal
under
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CNA2007101080520A
Other languages
Chinese (zh)
Other versions
CN100478285C (en
Inventor
黄明
张学洪
何强
王敦球
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Guilin University of Technology
Original Assignee
Guilin University of Technology
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Guilin University of Technology filed Critical Guilin University of Technology
Priority to CNB2007101080520A priority Critical patent/CN100478285C/en
Publication of CN101066793A publication Critical patent/CN101066793A/en
Application granted granted Critical
Publication of CN100478285C publication Critical patent/CN100478285C/en
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02WCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W10/00Technologies for wastewater treatment
    • Y02W10/10Biological treatment of water, waste water, or sewage

Landscapes

  • Treatment Of Sludge (AREA)

Abstract

The present invention discloses process of eliminating heavy metals from city sewage and sludge. The heavy metal eliminating apparatus consists of simplified sequencing batch bioreactor, concentrating and settling tank and pH regulating tank, and the simplified sequencing batch bioreactor as the main treating apparatus operates in the simplified process comprising feeding sludge, aerobic reaction, aerobic sludge elimination and feeding sludge. The main reactor has exhaust ratio designed in optimal sludge inoculating amount, and the un-exhausted sludge is used for the next batch. The present invention has short treating period, and the treated sludge has the contents of residual Cu, Zn, Cd, Ni and other heavy metal reaching relevant standard.

Description

Remove the method for heavy metal in the city sewage and sludge
Technical field
The present invention relates to a kind ofly can solve the exceed standard heavy metal removal method of problem of heavy metal concentration in the city sewage and sludge.
Background technology
Along with the raising year by year of China's treatment rate of domestic sewage, the safe disposal of the municipal sludge that output is huge and utilize problem to become the key of restriction municipal sewage treatment cause benign development.Regular product as municipal sewage treatment, contain holophytic nutrition elements such as abundant nitrogen, phosphorus, potassium and organic matter in the municipal sludge, through being the good source of manure and good soil improvement agent after innoxious, the stabilization treatment, therefore, the resource utilization of city sewage and sludge is agricultural is paid attention to by people gradually.But be the combined sewage of trade effluent and sanitary sewage in the water inlet of the most sewage works of China, heavy metal element wherein is concentrated in the mud by effect such as chemical settling, microorganism absorption absorptions in sewage treatment process, causes that Cu, Zn, heavy metals such as Cd, Ni are in the level of exceeding standard for a long time in the sewage sludge in China majority cities.As utilizing these to contain high concentration sludge, to carry out resource utilization agricultural, can be to being received that soil, farm crop and plant produce reality or potential endangers.At present, mainly adopt in mud at this problem and to add passivator and alkaline material wherein heavy metal is carried out stabilization treatment, the total amount of heavy metal does not obtain cutting down in the mud of back owing to handle, and easily causes influence such as the series of negative of using the decline of soil soil property, crop production reduction or heavy metal accumulation in its follow-up recycling process.Propose to utilize the bioleaching method to remove or cut down the heavy metal element of mud middle and high concentration at the existing part expert of this problem China, wherein Agricultural University Of Nanjing is 02112924.X (method of thiobacillus ferrooxidant and removal sludge heavy-metal thereof) and 200410014801.X (biological eliminating method of chromium in thiobacillus thiooxidans and the leather-making mud) about two patents of this technology, wherein the former has mainly reported these class methods of utilizing the thiobacillus ferrooxidans to remove sludge heavy-metal, the latter then is primarily aimed at industrial leather-making mud and has invented the treatment process that removes heavy metal chromium in the leather-making mud, but processing is constructed more in this technology, technical process is long, seed sludge derives from the mud of post precipitation, and adopt machinery to reflux, be not suitable for the removal of heavy metal in the municipal sludge.For city sewage and sludge is handled, should consider to utilize existing processing to construct the excess sludge that produces is carried out the heavy metal removing processing with the place.
Summary of the invention
The objective of the invention is in the recycling process of city sewage and sludge to the deficiency of heavy metal content control techniques; taking into full account under the prerequisite of utilizing the existing sludge treatment structures in municipal sewage plant; provide a kind of simple and easy to do, be easy to the method for heavy metal in the removal city sewage and sludge of large-scale promotion and application.
Concrete steps of the present invention are
(1) excess sludge of municipal sewage plant's secondary sedimentation basins and acidophilic microorganism are grown required energy matter is sent in the sbr reactor device, carries out the domestication of indigenous acidophilic microorganism under the aeration condition;
(2) brake specific exhaust emission mud during ORP=500mv, is discharged by design in pH of mixed=2.5 in reactor, is rich in acidophilic microorganism in the remaining mud, as the seed sludge of reactor operation;
(3) fresh sludge is sent in the sbr reactor device by secondary sedimentation basins by sludge pump, in the sbr reactor device, add energy matter by the metering administration device simultaneously, seed sludge in fresh sludge and energy matter and the reactor is thorough mixing under the aeration effect, enters the aerated reaction stage after reaching the design and operation water level;
(4) muddy water mixed solution after the processing is pressed design discharge brake specific exhaust emission mixed solution to the concentrating and precipitating pond under the waterpower state that keeps aeration to stir;
(5) muddy water mixed solution of Pai Chuing enters the concentrating and precipitating pond, realizes that mud concentrates and solid-liquid separation, and the mud after concentrating is through dehydration, and is used for follow-up recycling after alkaline material mixes;
(6) the concentration basin supernatant liquor enters the pH regulator pond, is back to the sewage treatment process section through transferring pH to alkali neutrality, after the high density heavy metal sludge collection of equalizing tank as the industrial raw material utilization;
(7) through after the step (4), the main body reactor is in the idle stage, and treatment process can continue by (3)~(4) operation, and so circulation is carried out.
Processing feature of the present invention and effect
(1) adopts periodical operation, meet the operation characteristic of current medium and small sludge of sewage treatment plant treatment process;
(2) this Processing Equipment is less, floor space is little, easy to operate, taken into full account the original sludge treatment of existing sewage work and constructed and construction characteristics;
(3) the main body reactor has also been finished the seeded process of leaching microorganism when finishing spoil disposal, and does not need to establish lift technique in addition, has reduced number of devices and has realized motorless sludge seeding operation;
(4) bioleaching liquid is back to sewage treatment process top after transferring pH, does not influence wastewater treatment efficiency;
(5) sediment that forms in the pH regulator pond is rich in plurality of heavy metal and ferro element, can be reclaimed or fully utilize;
(6) change traditional precipitation sludge discharge way, adopted more to utilize to keep microorganism active and inhomogeneity aeration sludge discharge way.
By the present invention handle typical urban mud running condition, with the ferrous sulfate is that energy matter carries out the bioleaching processing, Cu, Zn, Ni, Cd etc. all obtain the clearance more than 70% in the mud of processing back, its residual content all reaches (GB4284-84) standard of country's " agricultural mud pollutent control criterion ", stable and reliable operation.
Description of drawings
Fig. 1 is a schema of the present invention.
Embodiment
Embodiment:
Adopt Guilin city urban sewage purification factory secondary sedimentation basins excess sludge, the fundamental characteristics of this mud sees Table 1.
The table 1 test fundamental characteristics of excess sludge
Project pH Organic (%) N (g/kg) P (g/kg) K (g/kg) Cu Zn Ni Cd Cr Pb
mg/kg
The result 6.6 39.6 48.3 21.1 8.5 444.6 971.6 57.2 19.4 111.1 139.2
(1) under the room temperature condition, the excess sludge in the heavy pond of municipal sewage plant's secondary is sent into sludge heavy-metal by sludge pump remove among the device SBR,, add ferrous sulfate (FeSO by 10g/L when excess sludge concentration (MLSS) is 8~12g/L 47H 2O) the energy substrate of cultivating as acidophilic microorganism, the perforated pipe by the reactor bottom setting provides O in mud 2And CO 2, aeration intensity is 2.0L/min.Through 6~8 days, the pH of mud dropped to 2.2, and the ORP value is elevated to 550mv, and acidophilic microorganism concentration increases in the mud, and thiobacillus ferrooxidant becomes superiority bacteria spp gradually, the seed sludge that the mud of this moment just moves as reactor start-up.
(2) enter the remaining seed sludge that is rich in microorganism in the mud of sbr reactor device and energy matter and the reactor, mixed fully under the aeration effect, acidophilic microorganism begins to make full use of energy matter and a large amount of breeding in system simultaneously, and sludge pH begins to descend;
(3) through after a while after the processing of (1.5~2.0 days), the pH value descends fast in the reactor, the ORP value raises rapidly, when energy matter is ferrous salt, the color of mud also considerable change can occur in the reactor, become brown by original chocolate, this moment, sludge pH reached Schwellenwert (2.0~2.5), and the reactor operation enters the spoil disposal stage.
(4) by testing when determining to be the energy substrate with the ferrous sulfate, be 1: 1.3 by the delivery ratio of sludge seeding amount 30% design sbr reactor device, single batch processing sludge quantity accounts for 70% of sbr reactor device useful volume.Add energy matter by the fresh sludge amount that enters reactor, carry out aeration simultaneously, mix.Through operation in 1~2 day, the pH of mud is 2.0~2.5, ORP is 480~550, the bio-oxidation rate of ferrous ion reaches more than 95% in the mud, keeping under the aeration state this moment, mud after handling is drained into the concentrating and precipitating pond outward, simultaneously the mud that is rich in microorganism according to operation design variable retained part in reactor as under the seed sludge of batch processed, consider the homogeneity and the microbic activity of seed sludge, adopt the aeration sludge discharge way, mud is by entering the concentrating and precipitating pond by draining than the outer comb that is provided with;
(5) mud mixed liquid of Pai Chuing enters the concentrating and precipitating pond, realizes that mud-water separation and mud concentrate;
(6) through after the step (4), sludge pump starts to be sent into secondary sedimentation basins mud SBR and adds energy matter, is so undertaken by (2)~(4) step, and entire treatment technology is moved so repeatedly.Mud mixed liquid after the processing is discharged mixed solution by the design delivery ratio under the waterpower state that keeps aeration to stir;
(7) mud behind the concentrating and precipitating adds milk of lime behind mechanical dehydration, in and acid sludge in order to later use.The supernatant liquor in concentrating and precipitating pond is rich in the plurality of heavy metal ion regulates pH to alkali neutrality with milk of lime, and removed heavy metal is concentrated in the sediment, can be used for Metal smelting or ferrite comprehensive utilization.Sewage behind the adjusting pH enters the sewage pump room of urban sewage treatment process.
Interpretation of result
Discharge mud centrifugation 15min under 4000r/min of SBR, the precipitation part is under field conditions (factors) or under the cold condition (40 ℃~60 ℃), with the mud oven dry, through HCl+HNO 3+ HClO 4After the mixing acid agent is cleared up, with the heavy metal content in the PE-AAnalyst700 type Atomic Absorption Spectroscopy AAS analysis digestion solution.As calculated, after reactor moves 2 days continuously, the clearance of Cu, Zn, Cd can reach 78.3%, 77.7%, 100% in the sewage sludge, residual concentration 100.5mg/kg and the 216.8mg/Kg of the element Cu that mainly exceeds standard and Zn, meet the agricultural sludge heavy-metal limitation standard of China, it is agricultural to carry out follow-up resource utilization.

Claims (5)

1, a kind of method of removing heavy metal in the city sewage and sludge is characterized in that concrete steps are:
(1) excess sludge of municipal sewage plant's secondary sedimentation basins and acidophilic microorganism are grown required energy matter is sent in the sbr reactor device, carries out the domestication of indigenous acidophilic microorganism under the aeration condition;
(2) brake specific exhaust emission mud during ORP=500mv, is discharged by design in pH of mixed=2.5 in reactor, is rich in acidophilic microorganism in the remaining mud, as the seed sludge of reactor operation;
(3) fresh sludge is sent in the sbr reactor device by secondary sedimentation basins by sludge pump, in the sbr reactor device, add energy matter by the metering administration device simultaneously, seed sludge in fresh sludge and energy matter and the reactor is thorough mixing under the aeration effect, enters the aerated reaction stage after reaching the design and operation water level;
(4) muddy water mixed solution after the processing is pressed design discharge brake specific exhaust emission mixed solution to the concentrating and precipitating pond under the waterpower state that keeps aeration to stir;
(5) muddy water mixed solution of Pai Chuing enters the concentrating and precipitating pond, realizes that mud concentrates and solid-liquid separation, and the mud after concentrating is through dehydration, and is used for follow-up recycling after alkaline material mixes;
(6) the concentration basin supernatant liquor enters the pH regulator pond, is back to the sewage treatment process section through transferring pH to alkali neutrality, after the high density heavy metal sludge collection of equalizing tank as the industrial raw material utilization;
(7) through after the step (4), the main body reactor is in the idle stage, and treatment process can continue by (3)~(4) operation, and so circulation is carried out.
2, method according to claim 1, it is characterized in that the energy matter of excess sludge, acidophilic microorganism growth of municipal sewage plant and seed sludge advance the mud stage at the sbr reactor device and obtain thorough mixing, when excess sludge concentration is 8~12g/L, substrate is a ferrous salt, under the room temperature condition, the dosage of energy substrate is a 10g/L mud.
3, method according to claim 1 is characterized in that under the sbr reactor device room temperature environment that to have a liking for the ferrous thiobacillus of acid oxidase serve as main when handling bacterial classification, and its delivery ratio is designed to 1: 1.3, and the reactor cycle of operation is 1~2 day.
4, method according to claim 1, it is characterized in that mud middle and high concentration heavy metal remove after the in addition utilization of resources, the sediment in the pH regulator pond is rich in Fe, Zn, Cu, also can be reclaimed or fully utilize.
5, method according to claim 1 is characterized in that sbr reactor device operation sequence obtains simplifying, and adopts the aeration spoil disposal, and microorganism has good activity in the seed sludge.
CNB2007101080520A 2007-05-22 2007-05-22 Process of eliminating heavy metals from city sewage and sludge Expired - Fee Related CN100478285C (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CNB2007101080520A CN100478285C (en) 2007-05-22 2007-05-22 Process of eliminating heavy metals from city sewage and sludge

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CNB2007101080520A CN100478285C (en) 2007-05-22 2007-05-22 Process of eliminating heavy metals from city sewage and sludge

Publications (2)

Publication Number Publication Date
CN101066793A true CN101066793A (en) 2007-11-07
CN100478285C CN100478285C (en) 2009-04-15

Family

ID=38879516

Family Applications (1)

Application Number Title Priority Date Filing Date
CNB2007101080520A Expired - Fee Related CN100478285C (en) 2007-05-22 2007-05-22 Process of eliminating heavy metals from city sewage and sludge

Country Status (1)

Country Link
CN (1) CN100478285C (en)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102730920A (en) * 2012-07-14 2012-10-17 哈尔滨工业大学 Preparation method of iron-based activated sludge and method for adsorbing heavy metals of cadmium, copper and/or lead in sewage by iron-based activated sludge
CN103739183A (en) * 2014-01-09 2014-04-23 浙江卓锦工程技术有限公司 Treatment method and treatment device for deep dehydration of industrial wastewater sludge
CN104370363A (en) * 2014-11-09 2015-02-25 吉林建筑大学 Microaerobic SBR (sequencing batch reactor) control parameters for treating nondegradable industrial wastewater
CN104370363B (en) * 2014-11-09 2017-01-04 吉林建筑大学 The micro-aerobic SBR processing indegradable industrial effluent controls parameter
CN107434751A (en) * 2017-08-04 2017-12-05 山东森博生物科技有限公司 A kind of method that biological organic carbon fertilizer is produced using black liquor of pulp making
CN108191183A (en) * 2018-01-23 2018-06-22 广东工业大学 The minimizing technology of heavy metals in city sewage sludge
CN109626600A (en) * 2019-01-31 2019-04-16 光大水务(深圳)有限公司 The preparation method and method for sludge treatment of a kind mud
CN114850195A (en) * 2022-07-06 2022-08-05 矿冶科技集团有限公司 Stabilizing agent for lead, arsenic and cadmium and method for treating multi-metal calcium-based slag mud by using stabilizing agent

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102730920A (en) * 2012-07-14 2012-10-17 哈尔滨工业大学 Preparation method of iron-based activated sludge and method for adsorbing heavy metals of cadmium, copper and/or lead in sewage by iron-based activated sludge
CN103739183A (en) * 2014-01-09 2014-04-23 浙江卓锦工程技术有限公司 Treatment method and treatment device for deep dehydration of industrial wastewater sludge
CN104370363A (en) * 2014-11-09 2015-02-25 吉林建筑大学 Microaerobic SBR (sequencing batch reactor) control parameters for treating nondegradable industrial wastewater
CN104370363B (en) * 2014-11-09 2017-01-04 吉林建筑大学 The micro-aerobic SBR processing indegradable industrial effluent controls parameter
CN107434751A (en) * 2017-08-04 2017-12-05 山东森博生物科技有限公司 A kind of method that biological organic carbon fertilizer is produced using black liquor of pulp making
CN108191183A (en) * 2018-01-23 2018-06-22 广东工业大学 The minimizing technology of heavy metals in city sewage sludge
CN109626600A (en) * 2019-01-31 2019-04-16 光大水务(深圳)有限公司 The preparation method and method for sludge treatment of a kind mud
CN114850195A (en) * 2022-07-06 2022-08-05 矿冶科技集团有限公司 Stabilizing agent for lead, arsenic and cadmium and method for treating multi-metal calcium-based slag mud by using stabilizing agent
CN114850195B (en) * 2022-07-06 2022-09-23 矿冶科技集团有限公司 Stabilizing agent for lead, arsenic and cadmium and method for treating multi-metal calcium-based sludge by using stabilizing agent

Also Published As

Publication number Publication date
CN100478285C (en) 2009-04-15

Similar Documents

Publication Publication Date Title
US6896804B2 (en) System and method for remediation of waste
CN101481194B (en) town domestic sewage treatment process
CN104230097A (en) Breeding sewage treatment method
La Riviere Microbial ecology of liquid waste treatment
CN107352752A (en) The method for improving the removal of sludge in activated sludge waste water treatment process and keeping discharge quality
CN109052827A (en) Food waste percolate enhanced processing method and system
CN100478285C (en) Process of eliminating heavy metals from city sewage and sludge
CN101508485A (en) System and method for cultivation of aerobic particle sewage sludge and for treating organic waste water
CN102765814A (en) Ecological water treatment method
CN102776140B (en) Cold-tolerant pseudomonas strain Den-05, and screening method and application thereof
CN101054250A (en) Technique for treating garbage percolate by combinated physicochemistry and organism bacterium
Mahesh et al. Advances in biotechnological tools for bioremediation of wastewater using bacterial–algal symbiotic system
CN101492225A (en) Method for treating wastewater of starch factory with complex enzyme/activated sludge process
CN110294533A (en) Continuous biological strengthening process suitable for treating coking wastewater
CN103395882A (en) Processing method and processing apparatus of high ammonia-nitrogen wastewater
CN103880155B (en) A kind of embedded nitrobacteria that utilizes carries out method and the device of nitration treatment to sanitary sewage
Fujie et al. Optimal operation of bioreactor system developed for the treatment of chromate wastewater using Enterobacter cloacae HO-1
CN108773912A (en) A kind of microbial inoculum treatment process of livestock and poultry cultivation sewage
CN105858873A (en) Method for culturing aerobic granular sludge through high-concentration medicine wastewater
CN102424509A (en) Novel method for processing heavy metal in sludge through bioleaching
Taylor et al. Empirical comparison of activated sludge and high rate algal ponding technologies used to recover water, nitrogen and carbon from brewery effluent
CN1644529A (en) Fully biological treatment of wastewater of nitrobenzol or aniline or their mixture
Mirel et al. Simulation of wastewater depolution processes by advanced biological methods
CN215208983U (en) Synergistic treatment system for performing nitrogen and phosphorus removal on low C/N sewage by utilizing kitchen waste hydrolysis acidification liquid
TWI670239B (en) System and method for treating wastewater

Legal Events

Date Code Title Description
C06 Publication
PB01 Publication
C10 Entry into substantive examination
SE01 Entry into force of request for substantive examination
C14 Grant of patent or utility model
GR01 Patent grant
C17 Cessation of patent right
CF01 Termination of patent right due to non-payment of annual fee

Granted publication date: 20090415

Termination date: 20100522